More than 1,000 environmental activists participated in a protest march against the Tesla electric car factory outside Berlin on Saturday, according to the police, following clashes and arrests the previous day. The demonstrators headed from a nearby railway station to US tech billionaire Elon Musk’s only European Tesla production site, in Grünheide. Several organizations had drummed up supporters for the event, aimed at warning of environmental dangers but also criticizing other car manufacturers. Some protesters chanted “Down with the shares, up with water protection.” The mood was tense, fo…